Shell of an electronic device



FIG. 1 is a perspective view of a shell of an electronic device showing our design;

FIG. 2 is a front elevational view of our design; and,

FIG. 3 is a side elevational view of a shell of an electronic device of FIG. 1.

In the drawings, the broken lines depict unclaimed environment. 

The ornamental design for a shell of an electronic device, as shown and described. 